Which of the following types of noncoding RNA chiefly functions in the processing and chemical modification of ribosomal RNAs (rRNAs)?

A) Small nuclear RNAs (snRNAs)
B) Small nucleolar RNAs (snoRNAs)
C) Small interfering RNAs (siRNAs)
D) Transfer RNAs (tRNAs)
E) MicroRNAs (miRNAs)